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Acute toxic effects of sodium selenate on the epiphyseal plate of the rat

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Abstract

Severe histopathological irregularities in the epiphyseal plates of rats became evident following three daily injections of sublethal amounts of sodium selenate. If administered on alternate days over a thirty-day period, the pathological effects are less pronounced. The articular cartilages are unaffected by the selenate. An attempt was made to influence a transplantable murine chondrosarcoma by chronic administration of sodium selenate to tumorbearing mice. The sodium selenate had no effect on the tumor.

It is suggested that the failure of the sodium selenate to influence articular cartilages and the murine chondrosarcoma may be related to the lower rate of biosynthesis occurring in these tissues as contrasted with the rate in the epiphyseal plate. Thus, in older rats, in which the rate of biosynthesis in the epiphyseal plate is less than that occurring in younger rats, the toxicity of sodium selenate seems to be attenuated.

Résumé

Des anomalies histologiques importantes des métaphyses de rats sont visible trois jours après injection quotidienne de doses sous-léthales de séléniate de sodium. Après administration tous les deux jours, pendant une période de trente jours, les effets pathologiques sont moins prononcés. Les cartilages articulaires ne sont pas atteints par le séléniate. Un essai a ététenté pour modifier un chondrosarcome murin transplantable par une administration de séléniate de sodium á des souris porteuses de tumeurs. Le séléniate de sodium n'a pas d'effet sur la tu meur.

Il semble que l'absence d'action du séléniate de sodium sur les cartilages articulaires et le chondrosarcome murin peut être liée á un degré moins élevé de biosynthèse dans ces tissus par rapport á la métaphyse. Ainsi, dans les rats plus âgés, où le taux de biosynthèses de la métaphyse est moins élevé que celui de rats plus jeunes, la toxicité du séléniate de sodium semble atténuée.

Zusammenfassung

Nach drei täglichen Injektionen von subletalen Dosen von Natriumselenat wurden schwere histopathologische Unregelmäßigkeiten in den Epiphysenplatten von Ratten sichtbar. Wenn das Präprarat and jedem 2. Tag während 30 Tagen verabreicht wurde, waren die pathologischen Wirkungen weniger ausgeprägt. Die Gelenkknorpel wurden von Elenat nicht beeinflußt. Durch chronische Verabreichung von Natriumselenat wurde versucht, ein transplantierbares Mäusechondrosarkom an tumortragenden Mäusen zu beeinflußen. Das Natriumselenat hatte keine Wirkung auf den Tumor.

Es wird vorgeschlagen, daß das Ausbleiben der Natriumselenat-Wirkung auf den Gelenkknorpel und auf das Mäusechondrosarkom einen Zusammenhang hat mit der niedrigen Biosyntheseaktivität in diesen Geweben, vergleichen mit derjenigen in den Epiphysenplatten. Deshalb scheint die Natriumselenat-Toxicität bei älteren Ratten vermindert zu sein, deren Biosyntheseaktivität in den Epiphysenplatten niedriger ist als jene der jüngeren Ratten.

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Campo, R.D., Bielen, R.J. Acute toxic effects of sodium selenate on the epiphyseal plate of the rat. Calc. Tis Res. 7, 318–330 (1971). https://doi.org/10.1007/BF02062621

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